Kakuni Braised Pork Belly Soy Cube

Kakuni (角煮, 'square simmered') is braised pork belly cut into large cubes (typically 5–7cm square) and slow-simmered in a deeply savoury-sweet combination of soy sauce, sake, mirin, and sugar until the collagen in the skin and fat melts into a gelatinous, lacquered coating and the meat becomes tender enough to cut with a spoon. The dish is emblematic of the Japanese approach to fatty pork: rather than rendering the fat out (as in Western pork preparations), Japanese kakuni technique preserves and celebrates the belly's fat layers — making them unctuously soft, deeply flavoured, and dramatically different in texture from raw fat. The initial preparation involves blanching the pork belly first in water with aromatics (negi, ginger) to remove impurities, then a long, slow simmer — 1.5–2 hours minimum — in the braising liquid. Kakuni is closely associated with Nagasaki's shippoku cuisine, which blended Chinese and Japanese cooking through the Nagasaki trading port, and with Okinawan rafute (a similar pork belly preparation that uses awamori in place of sake and kurozato in place of sugar). The dish is also a classic ramen topping — chashu — in its rolled form.